Reposted by @hansotten.bsky.socialKIM-1 @kim-6502.bsky.social · 06/10/2026Hans Otten has translated some period Dutch KIM-1 magazine articles into English. Enjoy! retro.hansotten.nl/radio-bullet... 092
hansotten.bsky.social @hansotten.bsky.social · 04/10/2026I never used anything but the official instructions. Anything undocumented will be unsupported in a next version, and that happened with the 65C02. 030
hansotten.bsky.social @hansotten.bsky.social · 03/10/2026From 1977 tot 1985 the Dutch magazine about electronics, Radio Bulletin published articles about the KIM-1 and developed expansions. I translated the articles to English, the published listings to MOS Tech assembler sources. retro.hansotten.nl/radio-bullet... 0124
hansotten.bsky.social @hansotten.bsky.social · 30/09/2026the KIM-1 Simulator, Notepad++ and comnand line interpreter. Edit, assemble with one click, load code in Simulator and run and debug with symbol table from assembler. 022
hansotten.bsky.social @hansotten.bsky.social · 26/09/2026And some more: Zero page shifter Telex Monitor Program Gregorian Clock PIA Buffer 020
hansotten.bsky.social @hansotten.bsky.social · 26/09/2026Yes, found it. Got 2 8K cards selected in a KIM-4. Maybe the colors could be adjusted a bit for the KIM-4, now I click in the blind. 010
hansotten.bsky.social @hansotten.bsky.social · 26/09/2026Awesome! A real KIM-1 LED display emulation, and audio cassette support. At KIM-1 1 MHz speed. Packed with a lot of fucntionality. I runs fine on my Windows (travel) notebook. The KIM-4 is coming soon? 110
Reposted by @hansotten.bsky.socialHans @hvs.bsky.social · 26/09/2026@hansotten.bsky.social @kim-6502.bsky.social Since I used photos and documents from your site, Hans, I thought I would let you know that I had Claude build a cross-platform KIM-1 emulator in C# and Avalonia (a cross-platform UI library). github.com/cantpitch/Ki...github.comGitHub - cantpitch/Kimulator: A Cross-Platform KIM-1 EmulatorA Cross-Platform KIM-1 Emulator. Contribute to cantpitch/Kimulator development by creating an account on GitHub. 221
hansotten.bsky.social @hansotten.bsky.social · 23/09/2026A short one on the KIM 6530 timer, also applicable on the 6532 timer: KIM Clock and timer, Radio Bulletin May 1980 retro.hansotten.nl/radio-bullet...retro.hansotten.nlRadio Bulletin articles in English – Retro Computing 011
hansotten.bsky.social @hansotten.bsky.social · 22/09/2026Added one more KIM-1 program today. Not from Radio Bulletin, but from Byte Book of Computer Music 1979: Teach KIM to Sing retro.hansotten.nl/6502-sbc/kim... 083
hansotten.bsky.social @hansotten.bsky.social · 20/09/2026Radio Bulletin published many articles around the KIM-1 in Dutch. I started a new project: translate the articles to English wit source, binary Articles now published Mastermind on the KIM Morse decoding with the KIM Melodiant Frequencymeter EPROM Programmer retro.hansotten.nl/radio-bullet... 194
Reposted by @hansotten.bsky.socialWi-Fi Sheep Tech Channel @wifisheep.bsky.social · 12/09/2026The first #Commodore computer? I finally got around to building my #8bit #KIM1 Uno An #Arduino based recreation of the classic MOS KIM-1 and a great little #6502 retro computing project. Watch the full build here: youtu.be/mdHqsPDwnJ0 #RetroComputing #VintageComputingyoutu.be#KIM #UNO A clone of...The first #commodore computer? #8bit #arduino build project!YouTube video by Wi-Fi Sheep Tech Channel 154
Reposted by @hansotten.bsky.socialosolabstech.bsky.social @osolabstech.bsky.social · 15/09/2026Episode 3 of the 20c Use the OpenSource Duino Protocol analyzer to study all the buses of a 6502 processor. en.osolabs.tech/the20c/the-2... 022
hansotten.bsky.social @hansotten.bsky.social · 09/09/2026retro.hansotten.nl/6502-sbc/kim...retro.hansotten.nl 021
hansotten.bsky.social @hansotten.bsky.social · 09/09/2026MICROCALCULATOR MODEL-85 A board that serves as a calculator accessible via a parallel 8 bit port, e.g. from a KIM-1. Send commands and read the calculated results. Made by Artisan Electronics in 1977. Acquired August 2026, as built in a KIM-1 with KIMSI system 1104
hansotten.bsky.social @hansotten.bsky.social · 29/08/2026retro.hansotten.nl/6502-sbc/app... A PAL version of the (now open source hardware) Apple 1 Replica by Vince Briel, great work by ExPLITretro.hansotten.nlReplica 1 TE PAL version – Retro Computing 162
hansotten.bsky.social @hansotten.bsky.social · 29/08/2026Found a scan of 'Microprocessor programming and applications for scientists and engineers (Richard R. Smardzewski' Aimed at the 6502 with AIM 65 examples. retro.hansotten.nl/microprocess... 080
hansotten.bsky.social @hansotten.bsky.social · 23/08/2026A boxed VIM-1 acquired in August 2026. The early SYM-1, the rename due to a naming conflict. 052
hansotten.bsky.social @hansotten.bsky.social · 23/08/2026In August 2026 I acquired an boxed engineering [SYM-2]prototype. It comes with two large circuit diagrams illustrating the design. retro.hansotten.nl/6502-sbc/syn... 0122
hansotten.bsky.social @hansotten.bsky.social · 22/08/2026Forethought Systems produced a motherboard, the KIMSI, for the KIM-1 in 1977 that enables to add 8 S-100 boards to a KIM-1. Photos and a high quality manual and brochure retro.hansotten.nl/6502-sbc/kim... 1102
hansotten.bsky.social @hansotten.bsky.social · 20/08/2026Three former General Instrument executives, John Paivinen, Mort Jaffe and Don McLaughlin, formed MOS Technology in Valley Forge, Pennsylvania in 1969. So the 'exiles' did not found MOS Technology in 1974, they joined the firm. 110
hansotten.bsky.social @hansotten.bsky.social · 18/08/2026cc65 has an excellent macro assembler and linker. Good for complex projects. C is OK. I hear good things about LLVM -MOS www.llvm-mos.org Try both!llvm-mos.org 010
hansotten.bsky.social @hansotten.bsky.social · 16/08/2026Thanks, yes, this is it. Short articles in Byte and Radio Electronics. In the meantime I have found the manaul on ebay and bought it. Will be able to tell more in a couple of weeks. 010
hansotten.bsky.social @hansotten.bsky.social · 16/08/2026With a system with a KIM-1 and a KIMSI I acquired came a board. The board is connected to the Application connector. IT has the markings microcalculator model-85. The display is made by HP 7447632K 14 digits. there are some unidentified ICs, 1CA-85, 1CD-85A. Any clue? 131
hansotten.bsky.social @hansotten.bsky.social · 14/08/2026With thanks to Jonathan Chapman of Glitchworks who found a Jolt system, here images of a Jolt with 4K memory, an experimenters board and the power supply. Here the images: retro.hansotten.nl/6502-sbc/jol... 031
hansotten.bsky.social @hansotten.bsky.social · 03/08/2026And all the local newsletters/magazines devoted to their favorite 6502 based computer! 010
hansotten.bsky.social @hansotten.bsky.social · 03/08/2026KB-9 or MOS TECH 6502 BASIC V1.1, a 9 digit BASIC for the KIM-1 The same BASIC as in the first PET , OSI, Applesoft. One of the first products of MICRO-SOFT Telephone support by Bill Gates and Paul Allen! Updated, improved and enhanced information and downloads retro.hansotten.nl/6502-sbc/kim... 021
hansotten.bsky.social @hansotten.bsky.social · 30/07/2026The Jolt and Superjolt deserve a mention! 000
hansotten.bsky.social @hansotten.bsky.social · 30/07/2026A deep dive into the TIM 6530-004 Jolt Superjolt Demon software. 1K 6502 code from 1975. The Jolt was maybe the first 6502 based computer, before the KIM-1 and la year before the Apple 1 retro.hansotten.nl/6502-sbc/jol...retro.hansotten.nlJOLT TIM DEMON explained – Retro Computing 053
hansotten.bsky.social @hansotten.bsky.social · 23/07/2026A bug in the KIM-1 monitor. I continued my pages on the KIM Explained and found a bug in the KIM-1 monitor: KIM 0200 A9 ;; 00BB 00 :: 00AA 00 ???? FFFF 1C The KIM-1 accepts ':'– '?', as hex characters A ..F! Read more about this in one of the KIM-1 Explained . retro.hansotten.nl/6502-sbc/kim...retro.hansotten.nlPRTBYT, GETBYT and PACK – Retro Computing 110
Reposted by @hansotten.bsky.socialGrantMeStrength @grantmestrength.bsky.social · 22/07/2026Yes it’s real. apps.apple.com/us/app/virtu... 0113
hansotten.bsky.social @hansotten.bsky.social · 13/07/2026The KIM-1 explained Based upon my experience and study of the KIM-1 since 1979. Many notes on paper and files everywhere. Now consolidated in a lot of pages. retro.hansotten.nl/6502-sbc/kim...retro.hansotten.nlThe KIM-1 explained – Retro Computing 0113
hansotten.bsky.social @hansotten.bsky.social · 09/07/2026Question on KIM-1: I saw once a table in a magazine with values for the serial interface 110 - 9600 baud CNTL30 and CNTH30 at 17F2 and 17F3 for various baudrates. I can not find it anymore. Any clues? 120
Reposted by @hansotten.bsky.socialNeil Andretti @masterhit.bsky.social · 08/07/2026Thanks to some software tricks, a simple and low-cost add-on circuit, and a new way to speed up a microprocessor, you can now build a video interface for your microcomputer for an investment of only $20 to $35. www.tinaja.com/glib/pop_ele...tinaja.com 052
hansotten.bsky.social @hansotten.bsky.social · 03/07/2026Only the 6530-002 is essential. It has the monitor ROM and I/O ports. if the 003 is missing the KIM-1 works fine. The 003 has the tape routines in the ROM. And ports free. With external parts easy to have alternatives for the 003. The 002 knows nothing of the 003. 021
hansotten.bsky.social @hansotten.bsky.social · 02/07/2026A refreshed page on suppressing the KIM-1 echo of TTY input, read non-blocking and make the TTY input deaf. Here I present solutions for these problems in software You can have serial input without echo, non-blocking and make the TTY input deaf for input. retro.hansotten.nl/6502-sbc/kim...retro.hansotten.nlSuppress the KIM-1 echo – Retro Computing 011
hansotten.bsky.social @hansotten.bsky.social · 29/06/2026Many sources of the KIM-1 monitor are floating around None deliver the real KIM-1 ROMs, . So in June 2026 I have typed in the source as listed in the User manual. Converted to MOS Tech assembler format, delivers the exact ROM binary including 00 filler bytes. retro.hansotten.nl/correct-kim-... 0185
hansotten.bsky.social @hansotten.bsky.social · 26/06/2026MOStermind is an implementation of the Mastermind board game for the KIM-1 computer. Developed by HKZ. codeberg.org/hkzlab/MOSte... Does it run on the KIM-1 Simulator? YES! You only have to set the FOCAL_V3D break setting in the Settings. 052
hansotten.bsky.social @hansotten.bsky.social · 23/06/2026it is the cpu in apple 2e kits it seems. just a 3 MHz 65c02. weird product number. 010
hansotten.bsky.social @hansotten.bsky.social · 23/06/2026I saw an advert on ebay (China seller) for a Rockwell 6503 IC 40 pin. The 6503 has 28! I ordered one I searched the internet for the 338-6503 printed on the IC and found references to it being a R65C02. And indeed, the 6502 testers recognized it as working 65C02. Weird! 121
hansotten.bsky.social @hansotten.bsky.social · 14/06/2026I acquired a 1 MHz IC R6500/1E Microprocessor Emulator Device, an IC made by Rockwell for developing applications for the R6500/1 Microcomputer family. More information on the R6500/1 retro.hansotten.nl/6502-sbc/aim... 072
hansotten.bsky.social @hansotten.bsky.social · 04/06/2026Again Eduardo Casino has enhanced the KIM-1 Simulator V2.3.0 – The Console has now a complete VT100 emulation DEC Special Character set – The K-1008 Visable Memory is fast! – All settings are saved between sessions retro.hansotten.nl/kim-1-simula... Demo here: youtu.be/GPxkr7j1P6kyoutu.beDemo of KIM-1 Simulator V2.3.0YouTube video by Hans Otten 094
hansotten.bsky.social @hansotten.bsky.social · 25/05/2026A KIM-3B is a 8K bytes memory expansion made by MOS Technology (already part of Commodore then) for the KIM-4 motherboard. I recently acquired a good looking KIM-3B myself. Nothing new, all is already known about it. Now with photos made by myself! 0111
